Thank you for your response. I have a good diet and take supplements. The hair loss and nail weakness started after taking thyroxine which I didnt even know I needed until I had a blood test. Had a blood test in hospital recently (attending for something else) and the consultant said levels were fine. I read that "Armour's contents are standardised and tested by four US labs whuch found that it was well within the safety specs laid down by the US Pharacopeia. In a TPA survey 1,500 hypothyroid patients, 78 per cent said they were not being helped by levothyroxine, which suggests the drug is not effective for the majority of the 250,000 Britons annual diagnosed with the condition."